after some absense I now plan to invest some time to build a clock device like the one on my old homepage uwe-freese.de. The old one was using assembler code, an inaccurate wired temp sensor and was not able to communicate to other devices.

It's planned that the new device can receive the DCF time, send it to other devices / the base station and can show a temperature that is received from another temp sensor. The use case is to show the outside temperature.

No specific / not decided. I wanted to use an old one I have here. Is there any difference?! As I know them, they give an output high/low signal, can be connected to any IO pin... I don't know any specific requirements the DCF receiver might have.